# R-Lines

Starting at the screen’s center, this program draws randomly long lines in a random direction. The lines cannot leave the screen.

``````# Python 2.7.7 Code
# Pygame 1.9.1 (for Python 2.7.7)
# Jonathan Frech 28th of August, 2015``````

``````# importing needed modules
import pygame, sys, time, math, os, random

""" CLASSES """
# dummy class for global variables
class dummy():
pass

""" FUNCTIONS """
# gets the position on a circle
# circle center                           : '_pos'
# circle radius                           : '_radius'
# angle from center to point on the circle: '_angle'
def getCirclePos(_pos, _radius, _angle):
return [
_pos[0] + _radius * math.cos(math.radians(_angle)),
_pos[1] + _radius * math.sin(math.radians(_angle))
]

# quits the program
def quit():
sys.exit()

""" TICK; RENDER """
# tick function
def tick():
# handle events
for event in pygame.event.get():
# quit
if event.type == pygame.QUIT:
quit()

# render function
def render():
p = getCirclePos(main.P, random.randint(10, 150), random.randint(0, 359))

for _ in range(0, 2):
if p[_] < 0:
p[_] = 0
elif p[_] > main.SIZE[_]-1:
p[_] = main.SIZE[_]-1

pygame.draw.line(main.SURF, [255, 255, 255], main.P, p)
main.P = p

# blit and flip
main.SCREEN.blit(main.SURF, [0, 0])
pygame.display.flip()

""" INIT """
# initialize program
def init():
main.WIDTH, main.HEIGHT = 1080, 720
main.SIZE = [main.WIDTH, main.HEIGHT]
main.CENTER = [main.WIDTH / 2., main.HEIGHT / 2.]
main.SCREEN = pygame.display.set_mode(main.SIZE)
main.SURF = pygame.Surface(main.SIZE)

main.CAPTION = "R-Lines"
main.TICKS = 0

main.P = main.CENTER[:]

# functions
pygame.display.set_caption(main.CAPTION)

""" RUN """
# run function (uses tick() and render())
def run():
ticksPerSecond = 60
lastTime = time.time() * 1000000000
nsPerTick =  1000000000.0 / float(ticksPerSecond)

ticks = 0
frames = 0

lastTimer = time.time() * 1000
delta = 0.0

while True:
now = time.time() * 1000000000
delta += float(now - lastTime) / float(nsPerTick)
lastTime = now
shouldRender = False

while delta >= 1:
ticks += 1
main.TICKS += 1
tick()
delta -= 1
shouldRender = True

if shouldRender:
frames += 1
render()

if time.time() * 1000 - lastTimer >= 1000:
lastTimer += 1000

# debug
# print("Frames: " + str(frames) + ", ticks: " + str(ticks))

frames = 0
ticks = 0

# main variable
main = dummy()
init()

# start program
run()``````
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